Method of producing ultrafine ground calcium carbonate

Details Method of producing ultrafine ground calcium carbonate Method of producing ultrafine ground calcium carbonate

1984-01-12

1988-12-27

Straub, Gary P.

Chemistry of inorganic compounds

Carbon or compound thereof

Oxygen containing

106465, C01F 524, C01F 1118, C04B 1428, C09C 102

Patent

active

047939850

ABSTRACT:
A process for producing ultrafine ground calcium carbonate is disclosed in which a dry feed stone is slurried to a 15 to 60% by weight solids slurry and dispersed with an organic dispersant. The dispersed slurry is fed to an attrition mill where it is bead ground to 50-70% less than 2 microns. The ground calcium carbonate is classified in a centrifuge into a product stream having from 70-99% of its particles less than 2 microns and an underflow stream of larger particles. The product stream is treated with ozone which serves not only to increase the brightness of the product but to return the slurry to a non-dispersed state. The calcium carbonate slurry is then dewatered to produce a 58-69% solids product suitable for preparing a higher solids slurry or for spray drying.

REFERENCES:
patent: 2260826 (1941-10-01), Booge
patent: 3309030 (1976-03-01), Molls et al.
patent: 3797610 (1974-03-01), Windle
patent: 4166582 (1979-09-01), Falcon-Steward
patent: 4251351 (1981-02-01), Bowman

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